(a.) Malcontent.

beef bellyache bellyaching bitch bitching complaining complaint complaintful crabbing crabby cranky croaking destructive criticism disappointed discontented disgruntled displeased dissatisfied dissent envious faultfinding grievance gripe griping groan groaning grouchy grouse grousing growling grumbling holler howl kick kicking malcontent malcontented murmuring muttering out of humor peeve peevish peevishness pet peeve petulance petulant protest querulant querulous querulousness rebellious resentful restive restless scolding sniping squawk squawking sulky unaccepting unaccommodating uneasy unfulfilled ungratified unhappy unsatisfied whining whiny yapping